Hi
Welcome to the site and good luck on your new purchase.
Been a Mazda Fanatic can tell you that the car is a good car and parts, expertise are plenty – You should do well on fuel as it’s a 1.3 , Hatch and a manual. Putting the interplay engine - well u might as well go for a car with a Interplay engine as u can save time & money and hassle of the change over.
The Mirage sounds to be a better deal but the accidents are questionable – To what extent has it been abused is a serious question.
As Charitha said – best u reserve 100K at lease for repairs, insurance and stuff like that
Best advise is – don’t be in a hurry to buys – there will always be a better deal out there and they tend to come up after you have done the purchase (Always happens to me )
Good luck once again